Issue 62

A.A. Maaty et alii, Frattura ed Integrità Strutturale, 62 (2022) 194-211; DOI: 10.3221/IGF-ESIS.62.14

Microstructure characterization of sustainable light weight concrete using trapped air additions

A. A. Maaty Structural Engineering Dept,Faculty of Engineering, Tanta University, Egypt saidmaaty@yahoo.com, http://orcid.org/0000-0002-3166-6556 Fryal M. Kamel, A.A. ELShami Misr Higher Institute of Eng.&Tech, Elmansura, Egypt engfryalkamel@yahoo.com, https://orcid.org/0000-0003-2302-3355 materialhnbrc@yahoo.com, http://orcid.org/0000-0002-9075-7669 A BSTRACT . Light-weight aggregate and trapped air additions (TAD) affect concrete performance and lead to the production of light-weight concrete (LWC). In this research, fourteen mixes were designed to study the effects of TAD type and content and pozzolanic material (PZ) type on the microstructure characterization of concrete. Aluminum powder (AP) and lightcrete (LC) were used as TAD with content equal to (0%, 0.25%, 0.50%, 0.57%). The PZ included silica fume (SF) and fly ash (FA) with content equal to 10% of the weight of cement. Tests were performed for compressive strength, density, SEM, EDS, XRD, and TGA/DTG. The results show that the compressive strength and density are reduced as TAD ratios are increased. On the other hand, the results of SEM and EDS showed that the production of calcium silicate hydrate (CSH) was reduced, but the pores and air voids were increased. However, the tests TGA/DTG performed showed that the hydration degree of the mix without TAD cement paste grew faster than the other mixes. K EYWORDS . Light-weight concrete (LWC); Trapped air additions (TAD); Pozzolanic materials (PZ); Compressive strength; Density; Microstructure.

Citation: Maaty, A. A., Kamel, F. M., ELShami, A. A., Microstructure characterization of sustainable light weight concrete using trapped air additions, Frattura ed Integrità Strutturale, 62 (2022) 194-211.

Received: 10.06.2022 Accepted: 24.08.2022 Online first: 26.08.2022 Published: 01.10.2022

Copyright: © 2022 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

I NTRODUCTION

ustainable building methods and materials are required to ensure the construction industry's safe and clean future since they presently account for more than 7% of global carbon dioxide emissions. Construction experts and scholars have taken various approaches to solve the building industry's environmental challenges over the last few decades. The primary components of concrete (cement, fine aggregate, and coarse aggregate) were used to replace them with eco friendly alternatives without compromising concrete's main mechanical and durability properties [1-3]. S

194